Redirect emails for non-users

Question

We are in the process of migrating to Exchange Online. Our current Exchange provider allows us to create a "contact" which can be emailed internally and externally and those emails are redirected to the external email.  For instance, we outsource
our accounting to an agency. They do not have an email account on our mail server. However, we have created a redirect where if anyone (internally or externally) emails to accounting@ company.com it automatically goes to the accountant's personal external
email mailbox.   How do I do this on Exchange Online?

Answer 1

What you want is for the rule that determines how the junk filter works to be evaluated before the redirect rule instead of after. You cannot directly tell Mail to do this (the junk rule is always evaluated after all the other rules), but you can define a rule of your own that mimics the one used by the junk filter and place it anywhere on the rules list.
Go to Mail > Preferences > Junk Mail and click the Advanced button. Take note of how that rule is defined, define one of your own that does exactly the same, and place it above the redirect rule, so that it's evaluated first. All incoming messages that don't satisfy the criteria of this rule will remain in the Inbox and be processed by the subsequent rules, which I believe is exactly what you want.